This topic describes the ST_Envelope function, which obtains the bounding box of a raster.
Syntax
geometry ST_Envelope(raster source);
geometry ST_Envelope(raster source,
integer pyramid);
Parameters
Parameter | Description |
---|---|
source | The raster whose bounding box you want to obtain. |
pyramid | The pyramid level at which the raster resides. Valid values start from 0. Default value: 0. |
Description
This function obtains the bounding box of a raster.
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Example
SELECT st_astext(st_envelope(rast_object))
FROM raster_table;
----------------------------------------------------
POLYGON((-180 90,180 90,180 -90,-180 -90,-180 90))
--Specify the pyramid level at which the raster resides.
SELECT st_astext(st_envelope(rast_object, 1))
FROM raster_table;
----------------------------------------------------
POLYGON((-180 90,180 90,180 -90,-180 -90,-180 90))